diff --git a/index.php b/index.php
index 73739cb..86c8a78 100644
--- a/index.php
+++ b/index.php
@@ -29,7 +29,12 @@ $loop->run();
 
 
 function handler(Psr\Http\Message\ServerRequestInterface $req) {
-    $ip = $req->getHeader('REMOTE_ADDR')[0];
+    $ip = $req->getHeader('REMOTE_ADDR');
+    if (!$ip) {
+        $ip = $req->getServerParams()['REMOTE_ADDR'];
+    } else {
+        $ip = $ip[0];
+    }
     $url = $req->getUri()->getPath();
     // strip start /
     $url = substr($url, 1);